JPH0817025A - Head cleaning system of videocassette recorder - Google Patents

Abstract

PURPOSE: To ease the wear of cleaning roller to obtain clear image by cleaning a head drum using alternately double cleaning rollers. CONSTITUTION: When a cam 3 rotates clockwise during the loading of tape, a sliding pin 7 moves along a guide groove 3a of the cam 3. Therefore, a lever 15 rotates on a pivot 8 and a cleaning roller 6 is placed in contact with a head drum 1 for cleaning the drum 1. In this case, the cleaning roller 16 is isolated from the drum 1. In addition, when the cam 3 rotates counterclockwise during unloading of the tape, the pin 7 moves in the inverse direction along the groove 3a. As a result, the roller 16 works for cleaning the drum 1. In this case, the roller 6 is isolated from the drum 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head cleaning system for a video cassette recorder, and more particularly to a head cleaning system for a cassette recorder having dual head cleaning rollers.

[0002]

2. Description of the Related Art In the accompanying drawings, FIGS. 1A and 1B show an example of a conventional head cleaning system for a video cassette recorder, and FIG. 1A shows a case of loading and unloading a video cassette tape. FIG. 1B is a diagram showing a state in which the cleaning roller is in contact with the head drum to clean the head drum. FIG. 1B shows that the head cleaning roller is separated from the head drum during a recording or reproducing operation of the video cassette recorder. It is drawing which shows a state. Figure 1 (A)
As shown in FIGS. 2B and 2B, the head drum 1 has the head 2 mounted on the outer peripheral surface thereof. The cam 3 is driven by a motor (not shown). A guide groove 3a that is eccentric to the cam shaft 4 is formed in the cam 3, and the guide groove 3a extends in the counterclockwise direction and the radial direction.

A sliding pin 7 that engages with the guide groove 3a of the cam 3 is inserted at one end of the lever 5, and a head cleaning roller 6 is rotatably installed at the other end.
The sliding pin 7 is guided by the rotation of the cam 3 into the guide groove 3
Sliding clockwise or counterclockwise in a. A pivot 8 is formed between the head cleaning roller 6 and the sliding pin 7, and the lever 5 is pivotally mounted on the pivot 8 so that the lever 5 can be rotated by the rotation of the cam 3. The lever 5 is inclined near the pivot 8.

When loading or unloading a video cassette tape, the cam 3 rotates clockwise as shown in FIG. 1A, and the sliding pin 7 is guided by the rotation of the cam 3 into the guide groove 3a of the cam 3. Sliding along. As a result, the lever 5 pivots on the pivot 8 in the direction of arrow A, and the head cleaning roller 6 comes into contact with the outer peripheral surface of the head drum 1,
The head drum 1 is cleaned by the cleaning roller 6.

On the other hand, when the video cassette recorder is in a recording or reproducing operation, the cam 3 rotates counterclockwise as shown in FIG. 1 (B), and the sliding pin 7 causes the sliding pin 7 to rotate in the guide groove of the cam. Figure 3A along 3a
Sliding in the opposite direction to. As a result, the lever 5 pivots on the pivot 8 in the direction of arrow B, so that the cleaning roller 6 is separated from the outer peripheral surface of the head drum 1.

[0006]

However, in the head cleaning system having the above-mentioned structure, only one time is required for loading or unloading the video tape.
Since the three cleaning rollers 6 contact the head drum 1 to clean the head drum 1, not only the cleaning roller 6 is easily contaminated, but also the head drum 1 is rather cleaned when the video cassette recorder is used for a long period of time. However, there is a problem in that the desired cleaning operation cannot be performed due to the contamination. Not only that, but since the cleaning operation is performed by one cleaning roller 6, there is a problem that the cleaning roller 6 is worn in a short time.

An object of the present invention is to provide a head cleaning system for a video cassette recorder which can solve the above-mentioned problems of the prior art.

[0008]

In order to achieve the above object, a cleaning system according to an embodiment of the present invention is a head cleaning system for a video cassette recorder, which is driven by a motor and extends eccentrically in a counterclockwise direction and a radial direction. A cam having a guide groove formed therein, a convergent one end and two branched other ends, and a substantially Y-shaped lever installed on a pivot, and the converged lever. Engaging means for rotatably fixed to one end, engaging with the guide groove of the cam, and slidingly moving along the guide groove when the cam rotates to pivot the lever on the pivot. And rotatably installed on each of the branched other ends of the levers, and when the cam rotates, alternately on the outer peripheral surface of the head drum along with the rotation of the levers. By touch comprising a pair of head cleaning roller for cleaning the head drum.

[0009]

With the above-described head cleaning system according to the present invention, the two head cleaning rollers alternately contact the head drum to clean the head drum during loading and unloading of the video cassette tape. The cleaning condition of the head drum is improved, and the wear of the cleaning roller is reduced.
Therefore, the life of the head drum and the cleaning roller is extended and a clear image can be obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS. 2A to 2C, and therefore, among the components shown in FIG.
The same components as those shown in (B) and (B) are designated by the same reference numerals, and the description thereof will be omitted in the following description. In this embodiment, the lever 15 is substantially Y-shaped and has one convergent end and two branched other ends. A sliding pin 7 as an engaging means for engaging with the guide groove 3a of the cam 3 is preferably rotatably inserted in the converged one end portion of the lever 15.

The sliding pin 7 is slidably moved in the clockwise or counterclockwise direction along the guide groove 3a by the rotation of the cam 3. The first head cleaning roller 6 and the second head cleaning roller 6 are respectively provided on the other two branched ends of the lever 15.
A head cleaning roller 16 and a head cleaning roller 16 are rotatably installed. A pivot 8 is installed between the first cleaning roller 6 and the sliding pin 7, and the lever 15 is installed so as to be able to pivot on the pivot 8 by the rotation of the cam 3. It is desirable that the lever 15 be inclined near the pivot 8.

First and second cleaning rollers 6, 1
6 is arranged so that when the cam 3 rotates, the lever 15 rotates to alternately contact the outer peripheral surface of the head drum 1. Hereinafter, the operation of the head cleaning system according to the exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2A, when the cam 3 rotates clockwise during loading of the video cassette tape, the sliding pin 7 slides along the guide groove 3a of the cam 3. As a result, the lever 15 pivots on the pivot 8 in the direction of arrow C, and the first cleaning roller 6 contacts the head drum 1 to clean the head drum 1. At this time, the second cleaning roller 16 is separated from the head drum 1.

On the other hand, when the video cassette tape is unloaded and the cam 3 rotates counterclockwise as shown in FIG. 2 (B), the sliding pin 7 causes the guide groove 3 of the cam 3 to move.
It slides along a in the opposite direction to that of FIG. 2A. Accordingly, the lever 15 moves on the pivot 8 by the arrow D.
By rotating in the direction of the second cleaning roller 16
Contacts the head drum 1 to clean the head drum 1. At this time, the first cleaning roller 6 is separated from the head drum 1.

When the video cassette recorder is in a recording or reproducing operation, as shown in FIG. 2C, all of the first and second cleaning rollers are separated from the head drum 1 by the rotation of the lever 15. .

[0016]

As described above, the head cleaning system of the present invention alternately uses the double head cleaning rollers to clean the head drum, thus preventing the head drum from being contaminated by the cleaning rollers. Therefore, it is possible to perform a desired head drum cleaning operation and reduce the wear of the cleaning roller. Therefore, the life of the head drum and the cleaning roller is extended and a clear image can be obtained.

Although the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments shown in the drawings, but various modifications and modifications can be made within the spirit and scope of the present invention. it can. As an example, in the above embodiment, it was described that the first cleaning roller contacts the head drum when loading the video tape and the second cleaning roller contacts the head drum when unloading the video tape. The second cleaning roller may contact the head drum at the time of, and the first cleaning roller may contact the head drum at the time of unloading.

Further, the lever is formed to have three or more branched ends, and each of the branched head cleaning rollers is installed, and these rollers are sequentially attached to the head drum by the rotation of the lever. It can also be contacted.

[Brief description of drawings]

FIG. 1A is a schematic view showing a head cleaning system of a conventional video cassette recorder, in which a head cleaning roller contacts a head drum to clean the head drum during loading and unloading of a video cassette tape. FIG. 6B is a drawing showing a state in which the head cleaning roller is separated from the head drum during recording or reproducing operation of the video cassette recorder in the head cleaning system.

FIG. 2A is a schematic view showing a head cleaning system of a video cassette recorder according to an embodiment of the present invention.
Drawing showing a state in which the head cleaning roller contacts the head drum to clean the head drum,
(B) is a drawing showing a state where the second head cleaning roller contacts the head drum to clean the head drum when the video cassette tape is unloaded in the head cleaning system of (A), and (C) is (A). 6 is a view showing a state in which the head cleaning roller is separated from the head drum during a recording or reproducing operation of the video cassette recorder in the head cleaning system of FIG.

[Explanation of symbols]

 1 Head Drum 3 Cam 3a Guide Groove 6 1st Cleaning Roller 7 Pin 8 Pivot 15 Lever 16 2nd Cleaning Roller

Claims (5)

[Claims] 1. A head cleaning system for a video cassette recorder, comprising a cam driven by a motor and having an eccentric guide groove extending in a counterclockwise direction and a radial direction; a converged one end portion and two branched portions. A lever mounted on a pivot having an end; fixed to the convergent end of the lever and engaging the guide groove of the cam, along the guide groove when the cam rotates. Engaging means for pivoting the lever on the pivot by slidingly moving the lever; rotation of the lever when the cam is rotatably installed at each of the branched other ends of the lever A video cassette recorder including a pair of head cleaning rollers for alternately contacting the outer peripheral surface of the head drum to clean the head drum. Dar's head cleaning system. 2. The head cleaning system for a video cassette recorder according to claim 1, wherein the lever is substantially Y-shaped. 3. The head cleaning system for a video cassette recorder according to claim 1, wherein the engaging means is a sliding pin. 4. The head cleaning system for a video cassette recorder according to claim 3, wherein the sliding pin is rotatably installed at the converged one end of the lever. 5. The head cleaning system for a video cassette recorder according to claim 2, wherein the lever is inclined near the pivot.